The identity of a Group 1 metal in a metal carbonate may also be determined by titration with acid． $$$\mathbf{Z}_{2} \mathrm{CO}_{3}$$$ is a Group 1 metal carbonate．The metal may or may not be the same as that in FA 1．You will determine which metal is present in $$$\mathbf{Z}_{2} \mathrm{CO}_{3}$$$ ． FA 3 is $$$7.26 \mathrm{gdm}^{-3} \mathbf{Z}_{2} \mathrm{CO}_{3}$$$ ． FA 4 is $$$0.0500 \mathrm{~mol} \mathrm{dm}^{-3}$$$ sulfuric acid， $$$\mathrm{H}_{2} \mathrm{SO}_{4}$$$ ． FA 5 is bromophenol blue indicator． For each test you should record all your observations in the spaces provided. Examples of observations include: - colour changes seen - the formation of any precipitate and its solubility (where appropriate) in an excess of the reagent added - the formation of any gas and its identification (where appropriate) by a suitable test. You should record clearly at what stage in a test an observation is made. Where no change is observed, you should write 'no change'. Where reagents are selected for use in a test, the name or correct formula of the element or compound must be given. If any solution is warmed, a boiling tube must be used. If any solid is heated, a hard-glass test-tube must be used. Rinse and reuse test-tubes and boiling tubes where possible. No additional tests should be attempted.

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_s25_qp_35 Year：2025 Question No：2(e)

Answer:

Knowledge points:

2.4.1.1 reacting masses (from formulae and equations) including percentage yield calculations

2.4.1.2 volumes of gases (e.g. in the burning of hydrocarbons)

2.4.1.3 volumes and concentrations of solutions

2.4.1.4 limiting reagent and excess reagent (When performing calculations, candidates’ answers should reflect the number of significant figures given or asked for in the question. When rounding up or down, candidates should ensure that significant figures are neither lost unnecessarily nor used beyond what is justified (see also Mathematical requirements section).) deduce stoichiometric relationships from calculations such as those in 2.4.1 (1)–(4)

4.1.1 explain the origin of pressure in a gas in terms of collisions between gas molecules and the wall of the container

4.1.2 understand that ideal gases have zero particle volume and no intermolecular forces of attraction

4.1.3 state and use the ideal gas equation pV = nRT in calculations, including in the determination of

Answer:

Knowledge points:

Solution:

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